Add `lax::open_hypergraph` function to delete a node

[statusfailed]

In the impl for lax::hypergraph::Hypergraph, add a function to delete a list of nodes

    pub fn delete_nodes(&mut self, ids: &[NodeId]) {
        todo!()
    }

You can assume that each id in ids is a valid NodeId for this Hypergraph (and panic if it's out-of-bounds).

You will need to:

• Remove each node from the list of node labels
• Remove old nodes and renumber remaining nodes in the adjacency list
• Renumber and remove nodes in the quotient map

NOTE: this method takes a slice of node ids, since removing them one-at-a-time will be less efficient.